Instrument used for measuring area of a map.

• A. Photolithography
• B. Pull-up
• C. Oblique Photography
• D. Planimeter

Answer: (D)

Measuring the area shown on a map is done with a planimeter. This instrument is built to determine the area of any closed shape by tracing its boundary; as you move the tracing arm around the outline, the device integrates the path and shows the enclosed area on a dial or digital readout. On a map, you align the planimeter with the shape, trace its perimeter, and read the area, converting to map units with the given scale.

The other options aren’t measuring instruments for this purpose: photolithography is a fabrication process for transferring patterns onto surfaces; pull-up isn’t a tool used to measure areas on maps; oblique photography is a type of aerial imagery, not an area-measuring device.